864af8ef7e
records.ss mixed the record/protocol/reify model with JVM exception emulation. Move the contiguous ex-info accessors, the exception supertype hierarchy, instance-check, case-string, and the instance-check def-var into records-interop.ss, loaded right after records.ss. Those are only called at runtime, so the relocated forms resolve fine; records.ss is now the value model and protocol dispatch. Runtime shim — no seed change.
91 lines
4.9 KiB
Scheme
91 lines
4.9 KiB
Scheme
;; records-interop.ss — JVM-emulation taxonomy split out of records.ss: the
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;; ex-info class accessors, the exception supertype hierarchy, and instance-check
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;; / case-string (the (instance? Class x) decision table). Loaded right after
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;; records.ss; instance-check forward-refs nothing in records.ss at load time.
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;; pmap? guard: ex-info maps are plain hash-maps, never sorted-map htables — and a
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;; bare jolt-get on a sorted-map would invoke its comparator on :jolt/type and throw.
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(define (ex-info-map? v)
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(and (pmap? v) (jolt=2 (jolt-get v jolt-kw-ex-type jolt-nil) jolt-kw-ex-info)))
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(define (ex-info-class v)
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(let ((c (jolt-get v jolt-kw-class jolt-nil)))
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(if (string? c) c "clojure.lang.ExceptionInfo")))
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;; immediate-parent chain of the JVM exception hierarchy (simple names). Drives
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;; instance? across exception supertypes — (instance? Throwable (ex-info …)) etc.
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(define exception-parent
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'(("ExceptionInfo" . "RuntimeException")
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("RuntimeException" . "Exception")
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("IllegalArgumentException" . "RuntimeException")
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("NumberFormatException" . "IllegalArgumentException")
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("IllegalStateException" . "RuntimeException")
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("UnsupportedOperationException" . "RuntimeException")
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("ArithmeticException" . "RuntimeException")
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("NullPointerException" . "RuntimeException")
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("ClassCastException" . "RuntimeException")
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("IndexOutOfBoundsException" . "RuntimeException")
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("ConcurrentModificationException" . "RuntimeException")
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("NoSuchElementException" . "RuntimeException")
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("UncheckedIOException" . "RuntimeException")
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("InterruptedException" . "Exception")
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("IOException" . "Exception")
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("FileNotFoundException" . "IOException")
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("UnsupportedEncodingException" . "IOException")
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("UnknownHostException" . "IOException")
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("SocketException" . "IOException")
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("ConnectException" . "IOException")
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("SocketTimeoutException" . "IOException")
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("MalformedURLException" . "IOException")
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("SSLException" . "IOException")
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("Exception" . "Throwable")
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("Error" . "Throwable")
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("AssertionError" . "Error")
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("Throwable" . "Object")))
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;; Is `wanted` (simple name) `cls` or a supertype of it? ExceptionInfo also
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;; implements the IExceptionInfo interface.
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(define (exception-isa? cls wanted)
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(let loop ((c cls))
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(cond ((not c) #f)
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((string=? c wanted) #t)
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((and (string=? c "ExceptionInfo") (string=? wanted "IExceptionInfo")) #t)
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(else (let ((p (assoc c exception-parent))) (loop (and p (cdr p))))))))
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;; instance-check: (type-sym val) — type/protocol membership.
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(define (instance-check type-sym val)
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(let ((tname (symbol-t-name type-sym)))
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(cond
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((jrec? val)
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(let ((tag (jrec-tag val)))
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(or (string=? tag tname)
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(and (> (string-length tag) (string-length tname))
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(string=? (substring tag (- (string-length tag) (string-length tname)) (string-length tag)) tname)))))
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((jreify? val) (let ((short (last-dot tname)))
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(and (memp (lambda (p) (string=? (last-dot p) short)) (jreify-protos val)) #t)))
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((ex-info-map? val) (exception-isa? (last-dot (ex-info-class val)) (last-dot tname)))
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(else (case-string tname val)))))
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(define (case-string tname val)
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(cond
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((member tname '("Number" "java.lang.Number")) (number? val))
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((member tname '("Long" "java.lang.Long" "Integer" "java.lang.Integer"))
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(and (number? val) (exact? val) (integer? val)))
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((member tname '("Double" "java.lang.Double" "Float" "java.lang.Float")) (and (number? val) (flonum? val)))
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((member tname '("Ratio" "clojure.lang.Ratio")) (and (number? val) (exact? val) (rational? val) (not (integer? val))))
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((member tname '("String" "java.lang.String" "CharSequence" "java.lang.CharSequence")) (string? val))
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((member tname '("Boolean" "java.lang.Boolean")) (boolean? val))
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((member tname '("Character" "java.lang.Character")) (char? val))
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((member tname '("Keyword" "clojure.lang.Keyword")) (keyword? val))
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((member tname '("Symbol" "clojure.lang.Symbol")) (jolt-symbol? val))
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((member tname '("Atom" "clojure.lang.Atom")) (jolt-atom? val))
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((member tname '("IFn" "clojure.lang.IFn" "Fn" "clojure.lang.Fn")) (procedure? val))
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((member tname '("Pattern" "java.util.regex.Pattern")) (regex-t? val))
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((member tname '("URI" "java.net.URI"))
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(and (jhost? val) (string=? (jhost-tag val) "uri")))
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((member tname '("File" "java.io.File")) (jfile? val))
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((member tname '("UUID" "java.util.UUID")) (juuid? val))
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(else #f)))
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;; str of a record uses a custom (Object toString) impl if the type defines one
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;; (deftype with no default toString relies on this); otherwise the map form
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;; without the leading # (Clojure's record .toString). converters.ss loads before
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;; records.ss, so this set! sees the registry — forward refs resolve at call time.
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(def-var! "clojure.core" "instance-check" instance-check)
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